Give mailing envelopes a little character (a silly snowman, for example) and call it a wrap for a gift book, puzzle, video or box of stationery.
Cut a basic snowman shape from construction paper, and use a few pieces of rolled masking tape to temporarily stick it to the face of the envelope.
Dip a soft sponge into blue tempera paint, and then dab color onto the envelope all around the snowman. Allow the paint to dry thoroughly.
Carefully remove the construction-paper cutout, and then use colored markers to draw a face, arms, a hat and buttons. For an authentic touch, glue on a miniature felt scarf.